Treatment equipment for wastewater from mineral processing reagent production

Abstract

The present invention provides a treatment device for mineral processing agent production wastewater, which relates to the technical field of wastewater treatment and comprises a wastewater sedimentation treatment tank. A water inlet pipe is arranged on the side wall of the wastewater sedimentation treatment tank. A stepped groove is penetrated through the water inlet pipe. A multifunctional mechanism is rotatably installed inside the stepped layer of the stepped groove. The multifunctional mechanism comprises a base. An inner ring is fixedly installed on the inner side of the base. A first gear ring is fixedly installed on the circumferential surface of the base. By optimizing the structure and layout of the device, the device as a whole can complete the uniform delivery of flocculants and the cleaning of raised surfaces and flat-topped cone blocks through a motor, and the structure for cleaning the raised surfaces and flat-topped cone blocks can also be disassembled more conveniently. The device has multiple functions. Moreover, since the flocculants of the wastewater are already present at various positions in the wastewater when the wastewater enters the wastewater sedimentation treatment tank, the working time of the subsequent mixing spindle assembly can be reduced. Therefore, a certain energy-saving effect can be achieved, and the device has strong practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and more specifically, particularly relates to a treatment device for wastewater produced by ore dressing reagent production. Background Art

[0002] Mineral processing reagents refer to chemical reagents used in the process of mineral processing to improve mineral processing efficiency, separate different minerals, improve mineral processing indicators, etc. These reagents mainly include yellow medicine series, black medicine series, sulfur-nitrogen series and foaming agent series, etc. In the mineral processing process, these reagents play a vital role. However, a large amount of wastewater will be generated in the process. If these wastewaters are not properly treated, they will cause serious pollution to the environment. Therefore, we need to pay enough attention to the use and treatment of mineral processing reagents and take effective measures to protect our environment.

[0003] 1. The wastewater generated during the production of existing mineral reagents usually needs to be flocculated in advance. The existing flocculation method usually involves transporting the wastewater into a sedimentation treatment tank, using a flocculant delivery device to deliver a certain amount of flocculant, and then turning on the mixing spindle to use the radial force generated by the mixing spindle to fully mix the flocculant. However, since the flocculant delivery area is small at this time, the mixing spindle needs to be stirred for a long time to achieve uniform mixing, resulting in insufficient flocculation efficiency and a need for improvement in practicality.

[0004] 2. The existing flocculation method is usually to transport the wastewater into the sedimentation treatment tank, use the flocculant delivery equipment to deliver a certain amount of flocculant, and use the radial force generated by the mixing spindle to complete the full mixing of the flocculant. However, since the flocculant delivery area is small at this time, the mixing spindle needs to be stirred for a long time. At the same time, since the resistance of the mixing spindle in the wastewater is large and the mixing time is long, the power consumption is also large, and the energy saving is insufficient and needs to be improved;

[0005] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and treatment equipment for mineral processing agent production wastewater is provided, in order to achieve a more practical purpose. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a treatment device for mineral processing reagent production wastewater to solve the above problems.

[0007] The treatment equipment for the wastewater produced by the ore dressing agent comprises a wastewater sedimentation treatment tank, a flocculant delivery pipeline and a metal bellows. The side wall of the wastewater sedimentation treatment tank is provided with an inlet pipeline, and a stepped groove is opened inside the inlet pipeline:

[0008] A multifunctional mechanism is rotatably installed inside the step layer of the step groove;

[0009] The multifunctional mechanism includes a base, an inner ring is fixedly installed on the inner side of the base, a first gear ring is fixedly installed on the circumferential surface of the base, a first gap groove is left between the base and the inner ring, a plurality of wedge blocks are fixedly installed on the inner side of the inner ring, each of the wedge blocks is provided with a raised surface on the upper end, a second gap groove is left between each of the wedge blocks, a flat-topped cone block is fixedly installed on the inner side of each raised surface, the flocculant delivery pipeline and the metal bellows are fixedly installed, the metal bellows is located above the flat-topped cone block, and a rotating ring is rotatably installed inside the first gap groove.

[0010] Preferably, a plurality of circular grooves are provided inside the rotating ring, a retaining ring is slidably installed between each of the circular grooves, a top plate is fixedly installed on the upper end of each retaining ring, a second toothed ring is fixedly installed between the retaining ring and the top plate, the second toothed ring is located above the first toothed ring, a brush is fixedly installed on the lower end of the top plate, the brush is adapted to the raised surface, the lower end of the brush is in contact with the surface of the raised surface, and a handle is symmetrically fixedly installed on the upper end of the top plate.

[0011] Preferably, a side groove is provided on the side wall of the stepped groove, and a first rotating shaft and a second rotating shaft are rotatably installed inside the side groove respectively, a first gear is fixedly installed on the circumferential surface of the first rotating shaft, and the first gear is meshed with the first gear ring, and a second gear is fixedly installed on the circumferential surface of the second rotating shaft, and the second gear is meshed with the first gear.

[0012] Preferably, a third gear is fixedly mounted on the circumferential surface of the second rotating shaft, the third gear is located above the second gear, the third gear is meshed with the second gear ring, an auxiliary rotating part is fixedly mounted on the upper end of the third gear, a motor is fixedly mounted on the upper end of the water inlet pipe, and the output shaft of the motor is fixedly mounted on the first rotating shaft.

[0013] Preferably, a mixing spindle assembly is provided on the inner side of the wastewater sedimentation treatment tank, an outlet pipe is provided on the side wall of the wastewater sedimentation treatment tank away from the water inlet pipe, an electric-controlled valve is provided inside the outlet pipe, the outlet pipe is located below the water inlet pipe, and a filter is provided inside the water inlet pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the present invention, a stepped groove is arranged inside the water inlet pipe, and the motor is turned on, so that the output shaft of the motor generates a radial force to drive the first rotating shaft to rotate, so that the first rotating shaft drives the first gear to rotate and mesh with the first gear ring, so that the first gear ring generates a radial force to drive the base and the inner ring to rotate inside the stepped groove. At this time, the rotation of the inner ring will generate a radial force, so that the flocculant transported into the flat-top cone block can use the radial force generated by it to evenly put the flocculant into the water inlet pipe through the second gap groove between the wedge blocks, so that the wastewater flowing into the wastewater sedimentation treatment tank through the water inlet pipe can be dissolved in the flocculant, so that when the wastewater enters the wastewater sedimentation treatment tank, the flocculant is already filled in various parts of the wastewater, which can greatly reduce the subsequent mixing time, thereby reducing the mixing time, improving the efficiency, and increasing the practicality;

[0016] In the present invention, by arranging a plurality of wedge-shaped blocks and leaving a second gap groove between each wedge-shaped block, when the inner ring rotates, the radial force generated can enable the flocculant to enter the wastewater in a rotating flow-like manner, thereby ensuring that the flocculant stays at most positions of the wastewater passing through the water inlet pipe, thereby improving the subsequent flocculation rate and further increasing the practicality;

[0017] In the present invention, by placing the snap ring into the circular groove, when the operator turns on the motor, the third gear can be indirectly driven to rotate, thereby driving the third gear to mesh with the second gear ring, so that the second gear ring generates a radial force to drive the top plate and the brush to rotate synchronously on the rotating ring, thereby completing the cleaning of the wedge block and improving the cleaning efficiency;

[0018] In the present invention, by turning on the motor, the motor drives the first gear on the first rotating shaft to rotate again, and at the same time, the first gear will mesh with the second gear and the first gear ring, so that the second rotating shaft drives the third gear to rotate, and then the third gear and the second gear ring are meshed, so that the rotation of the base and the inner ring is opposite to the rotation direction of the second gear ring, and then the rotation direction of the brush is opposite to the rotation direction of the wedge block, so that it can achieve more favorable cleaning and further improve the cleaning efficiency;

[0019] In the present invention, by providing the raised surface and the flat-topped cone block, the device can make the water flow or the flocculant flow at an inclined surface when cleaning the wedge block or adding the flocculant, so that when processing the wedge block, each corner can be cleaned more thoroughly, and the cleaning efficiency is improved. When adding the flocculant, the flocculant can be more evenly distributed in the water, the flocculation effect is enhanced, the overall operation efficiency of the device is improved, and the practicality is improved.

[0020] In the present invention, by optimizing the structure and layout of the device, the device as a whole can complete the uniform delivery of flocculants and the cleaning of the raised surface and the flat-topped cone block through a motor, and the structure for cleaning the raised surface and the flat-topped cone block can be disassembled more conveniently. It has many functions and greatly reduces labor costs. In addition, since the flocculants in the wastewater are already present at various positions in the wastewater when it enters the wastewater sedimentation treatment tank, the working time of the subsequent mixing spindle assembly can be reduced, so it can also achieve a certain energy-saving effect and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional explosion structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the water inlet pipeline of the present invention;

[0024] Figure 4 is a cross-sectional view of a water inlet pipe of the present invention;

[0025] Figure 5 It is a schematic diagram of the explosion structure of the water inlet pipe connection of the present invention;

[0026] Figure 6 It is a schematic diagram of the top plate connection explosion structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the inner ring connection explosion structure of the present invention;

[0028] Figure 8 is a cross-sectional view of the inner ring of the present invention;

[0029] Fig. 9 It is a schematic diagram of the rotating ring connection explosion structure of the present invention;

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the flat-top cone block of the present invention.

[0031] In the figure, the corresponding relationship between the component names and the figure numbers is: 11, wastewater sedimentation treatment tank; 12, water inlet pipe; 13, stepped groove; 14, base; 15, inner ring; 16, first gear ring; 17, first gap groove; 18, wedge block; 19, raised surface; 21, second gap groove; 22, flat-top cone block; 23, rotating ring; 24, circular groove; 25, snap ring; 26, top plate; 27, second gear ring; 28, brush; 29, handle; 31, side groove; 32, first rotating shaft; 33, first gear; 34, second rotating shaft; 35, second gear; 36, third gear; 37, auxiliary rotating part; 38, motor; 39, flocculant delivery pipe; 41, metal bellows; 42, mixing spindle assembly; 43, water outlet pipe; 44, electric control valve; 45, filter. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] See also Figure 1 - Fig.10 The present invention provides a treatment device for mineral processing reagent production wastewater, including a wastewater sedimentation treatment tank 11, a flocculant delivery pipeline 39 and a metal bellows 41. A water inlet pipeline 12 is provided on the side wall of the wastewater sedimentation treatment tank 11, and a stepped groove 13 is opened inside the water inlet pipeline 12:

[0034] A multifunctional mechanism is rotatably mounted inside the step layer of the step groove 13;

[0035] The multifunctional mechanism includes a base 14, an inner ring 15 is fixedly installed on the inner side of the base 14, a first gear ring 16 is fixedly installed on the circumferential surface of the base 14, a first gap groove 17 is left between the base 14 and the inner ring 15, a plurality of wedge blocks 18 are fixedly installed on the inner side of the inner ring 15, each wedge block 18 has a raised surface 19 on the upper end, a second gap groove 21 is left between each wedge block 18, and a flat-top cone block 22 is fixedly installed on the inner side of each raised surface 19. By arranging a plurality of wedge blocks 18 and leaving a second gap groove 21 between each wedge block 18, when the inner ring 15 rotates, the radial force generated can enable the flocculant to enter the wastewater in a rotating flow-like manner. In the process, it can be ensured that flocculants stay at most positions of the wastewater passing through the water inlet pipe 12, thereby improving the subsequent flocculation rate and further increasing the practicality. By setting the raised surface 19 and the flat-top cone block 22, the device can make the water flow or flocculant flow at an inclined surface when cleaning the wedge block 18 or adding the flocculant, so that when processing the wedge block 18, every corner can be cleaned more thoroughly, thereby improving the cleaning efficiency. When adding the flocculant, the flocculant can be more evenly distributed in the water, thereby enhancing the flocculation effect, improving the overall operation efficiency of the device, and improving the practicality.

[0036] The flocculant delivery pipeline 39 and the metal bellows 41 are fixedly installed. The metal bellows 41 is located above the flat-topped cone block 22. A rotating ring 23 is rotatably installed inside the first gap groove 17. By optimizing the structure and layout of the device, the device as a whole can complete the uniform delivery of flocculant and the cleaning of the raised surface 19 and the flat-topped cone block 22 through the motor 38, and the structure for cleaning the raised surface 19 and the flat-topped cone block 22 can also be disassembled more conveniently. It has many functions and greatly reduces labor costs. In addition, since the flocculant of the wastewater is already present at various positions in the wastewater when it enters the wastewater sedimentation treatment tank 11, the working time of the subsequent mixing main shaft assembly 42 can be reduced, so it can also achieve a certain energy-saving effect and has strong practicality.

[0037] A plurality of circular grooves 24 are provided inside the rotating ring 23, and a snap ring 25 is slidably installed between each circular groove 24, and a top plate 26 is fixedly installed on the upper end of each snap ring 25, and a second gear ring 27 is fixedly installed between the snap ring 25 and the top plate 26, and the second gear ring 27 is located above the first gear ring 16, and a brush 28 is fixedly installed on the lower end of the top plate 26, and the brush 28 is adapted to the raised surface 19, and the lower end of the brush 28 is in contact with the surface of the raised surface 19, and a handle 29 is symmetrically fixedly installed on the upper end of the top plate 26, and a stepped groove 13 is provided inside the water inlet pipe 12, and the motor 38 is turned on, so that the output shaft of the motor 38 generates a radial force to drive the first rotating shaft 32 to rotate, so that the first rotating shaft 32 drives the first gear 33 to rotate and mate with the first gear The ring 16 is meshed, so that the first gear ring 16 generates a radial force to drive the base 14 and the inner ring 15 to rotate inside the stepped groove 13. At this time, the rotation of the inner ring 15 will generate a radial force, so that the flocculant transported into the flat-top cone block 22 can use the radial force generated by it to evenly pass through the second gap groove 21 between the wedge blocks 18 to put the flocculant into the water inlet pipe 12, so that the wastewater flowing into the wastewater sedimentation treatment tank 11 through the water inlet pipe 12 can be dissolved in the flocculant, so that when the wastewater enters the wastewater sedimentation treatment tank 11, the flocculant has been filled in various parts of the wastewater, which can greatly reduce the subsequent mixing time, thereby reducing the mixing time, improving efficiency, and increasing practicality.

[0038] A side groove 31 is provided on the side wall of the step groove 13, and a first rotating shaft 32 and a second rotating shaft 34 are rotatably mounted inside the side groove 31, a first gear 33 is fixedly mounted on the circumferential surface of the first rotating shaft 32, and the first gear 33 is meshed with the first gear ring 16, a second gear 35 is fixedly mounted on the circumferential surface of the second rotating shaft 34, and the second gear 35 is meshed with the first gear 33, a third gear 36 is fixedly mounted on the circumferential surface of the second rotating shaft 34, and the third gear 36 is located above the second gear 35. The third gear 36 is meshed with the second gear ring 27, an auxiliary rotating member 37 is fixedly installed on the upper end of the third gear 36, a motor 38 is fixedly installed on the upper end of the water inlet pipe 12, and the output shaft of the motor 38 is fixedly installed on the first rotating shaft 32. A mixing main shaft assembly 42 is provided on the inner side of the wastewater sedimentation treatment tank 11, and a water outlet pipe 43 is provided on the side wall of the wastewater sedimentation treatment tank 11 away from the water inlet pipe 12. An electric control valve 44 is provided inside the water outlet pipe 43. The water outlet pipe 43 is located below the water inlet pipe 12. A filter screen 45 is provided inside the pipe 12. By placing the retaining ring 25 into the circular groove 24, the staff can indirectly drive the third gear 36 to rotate when turning on the motor 38, and then drive the third gear 36 to mesh with the second gear ring 27, so that the second gear ring 27 generates a radial force to drive the top plate 26 and the brush 28 to rotate synchronously on the rotating ring 23, complete the cleaning of the wedge block 18, and improve the cleaning efficiency. When the motor 38 is turned on, the motor 38 will drive the first gear 33 on the first rotating shaft 32 to rotate again. At the same time, the first gear 33 will mesh with the second gear 35 and the first gear ring 16, so that the second rotating shaft 34 drives the third gear 36 to rotate, and then the third gear 36 is meshed with the second gear ring 27. Therefore, the rotation of the base 14 and the inner ring 15 is opposite to the rotation direction of the second gear ring 27, and then the rotation direction of the brush 28 is opposite to the rotation direction of the wedge block 18, which can achieve more favorable cleaning and further improve the cleaning efficiency.

[0039] Working principle:

[0040] The first step is that when it is necessary to treat the wastewater, the staff can first use the wastewater conveying equipment (the wastewater conveying equipment is an existing technology, mainly composed of a conveyor and a water pump) to convey the wastewater through the water inlet pipe 12 into the wastewater sedimentation treatment tank 11. At the same time, the wastewater will be filtered through the filter 45. Then the staff can simultaneously start the flocculant delivery equipment (the flocculant delivery equipment is an existing equipment, mainly composed of a tank body, a batching barrel, a quantitative conveyor, a flocculant delivery pipe 39 and a metal bellows 41), so that the diluted flocculant can pass through the flocculant delivery pipe 39 and the metal bellows 41 (the flocculant delivery pipe 39 and the flocculant delivery equipment The metal bellows 41 is connected to the discharge pipe of the flocculant delivery device, and is used to deliver the flocculant quantitatively discharged by the flocculant delivery device into the metal bellows 41. The metal bellows 41 is a relatively flexible pipe made of metal material, which is mainly used to transmit various fluids including gases and liquids or as a part of a mechanical structure. It is composed of a metal braided layer and an inner lining layer, and has good flexibility, pressure resistance and temperature resistance. The flocculant is delivered to the flat-top cone block 22 (the metal bellows 41 is not in contact with the top plate 26. When the flocculant is delivered, since the metal bellows 41 is located above the flat-top cone block 22, the flocculant will drip directly onto the flat-top cone block 22). Then the staff can turn on the motor 38 to make the flocculant drip directly onto the flat-top cone block 22. The output shaft of the motor 38 generates a radial force to drive the first rotating shaft 32 to rotate, so that the first rotating shaft 32 drives the first gear 33 to rotate and mesh with the first gear ring 16, so that the first gear ring 16 generates a radial force to drive the base 14 to rotate inside the stepped groove 13. At the same time, since the base 14 and the inner ring 15 are fixedly installed, the movement of the base 14 will also drive the inner ring 15 to rotate synchronously. At this time, the rotation of the inner ring 15 will generate a radial force, so that the flocculant transported into the flat-top cone block 22 can use the radial force generated by it to evenly pass through the second gap groove 21 between the wedge blocks 18 to put the flocculant into the water inlet pipe 12, so that the flocculant can be evenly delivered into the water inlet pipe 12 through the inlet pipe 12. The wastewater flowing through the water pipe 12 into the wastewater sedimentation treatment tank 11 can be dissolved in the flocculant. After the wastewater is transported, the staff can simultaneously close the wastewater transport equipment and the flocculant delivery equipment, and open the mixing spindle assembly 42, so that the mixing spindle assembly 42 can fully mix the wastewater inside the wastewater sedimentation treatment tank 11. After the flocculation is completed, the staff can open the electric control valve 44, so that the wastewater can be transported to the next process through the outlet pipe 43 (in the process of flocculant delivery, the clamping ring 25 and the circular groove 24 are in a non-contact state, so when the raised surface 19 needs to be cleaned later, the staff needs to additionally install the clamping ring 25 as a whole in the circular groove 24);

[0041] In the second step, when the staff needs to clean the raised surface 19, the staff can pick up the handle 29 and insert the clamping ring 25 into the circular groove 24. At the same time, the staff can rotate the auxiliary rotating member 37 so that the auxiliary rotating member 37 generates a radial force to drive the second rotating shaft 34 and the second gear 35 to rotate inside the side groove 31, thereby completing the tooth alignment of the second gear ring 27 and the third gear 36. Then the staff can put the water pipe into the through groove left at the center of the top plate 26 and turn on the motor 38 again, so that the motor 38 drives the first gear on the first rotating shaft 32 again. The wheel 33 rotates, and at the same time, the first gear 33 will mesh with the second gear 35 and the first gear ring 16, so that the second rotating shaft 34 drives the third gear 36 to rotate, and then the third gear 36 meshes with the second gear ring 27. Therefore, the rotation of the base 14 and the inner ring 15 is opposite to the rotation direction of the second gear ring 27, so that the second gear ring 27 generates a radial force to drive the third gear 36 and the brush 28 to rotate synchronously on the rotating ring 23. At the same time, the brush 28 will clean the surface of the raised surface 19 and fully clean it with the water sprayed from the water pipe.

[0042] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A treatment device for wastewater from the production of mineral processing reagents, comprising a wastewater sedimentation treatment tank (11), a flocculant delivery pipeline (39) and a metal bellows (41), wherein a water inlet pipeline (12) is provided on the side wall of the wastewater sedimentation treatment tank (11), and a stepped groove (13) is provided inside the water inlet pipeline (12), characterized in that: A multifunctional mechanism is rotatably mounted inside the step layer of the step groove (13); The multifunctional mechanism comprises a base (14), an inner ring (15) is fixedly mounted on the inner side of the base (14), a first gear ring (16) is fixedly mounted on the circumferential surface of the base (14), a first gap groove (17) is reserved between the base (14) and the inner ring (15), a plurality of wedge blocks (18) are fixedly mounted on the inner side of the inner ring (15), each of the wedge blocks (18) is provided with a raised surface (19) at the upper end, a second gap groove (21) is reserved between each of the wedge blocks (18), a flat-top cone block (22) is fixedly mounted on the inner side of each of the raised surfaces (19), the flocculant delivery pipeline (39) and the metal bellows (41) are fixedly mounted, and a rotating ring (23) is rotatably mounted inside the first gap groove (17); The rotating ring (23) is provided with a plurality of circular grooves (24) inside, a snap ring (25) is slidably mounted between each of the circular grooves (24), a top plate (26) is fixedly mounted on the upper end of each of the snap rings (25), a second gear ring (27) is fixedly mounted between the snap ring (25) and the top plate (26), a brush (28) is fixedly mounted on the lower end of the top plate (26), the brush (28) is matched with the raised surface (19), and a handle (29) is symmetrically fixedly mounted on the upper end of the top plate (26); A side groove (31) is provided on the side wall of the stepped groove (13), and a first rotating shaft (32) and a second rotating shaft (34) are rotatably mounted inside the side groove (31), a first gear (33) is fixedly mounted on the circumferential surface of the first rotating shaft (32), and the first gear (33) is meshed with the first gear ring (16), a second gear (35) is fixedly mounted on the circumferential surface of the second rotating shaft (34), and the second gear (35) is meshed with the first gear (33), and a third gear (36) is fixedly mounted on the circumferential surface of the second rotating shaft (34), and the third gear (36) is located above the second gear (35), and the third gear (36) is meshed with the second gear ring (27).

2. The treatment equipment for mineral processing reagent production wastewater according to claim 1, characterized in that: An auxiliary rotating member (37) is fixedly mounted on the upper end of the third gear (36), a motor (38) is fixedly mounted on the upper end of the water inlet pipe (12), and an output shaft of the motor (38) is fixedly mounted on the first rotating shaft (32).

3. The treatment equipment for mineral processing reagent production wastewater as claimed in claim 2, characterized in that: A mixing main shaft assembly (42) is provided inside the wastewater sedimentation treatment tank (11), and a water outlet pipe (43) is provided on the side wall of the wastewater sedimentation treatment tank (11) away from the water inlet pipe (12).

4. The treatment equipment for mineral processing reagent production wastewater as claimed in claim 3, characterized in that: An electric control valve (44) is provided inside the water outlet pipe (43); the water outlet pipe (43) is located below the water inlet pipe (12); and a filter screen (45) is provided inside the water inlet pipe (12).

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